Grinding fixtures



June 25, 1963 T ECKERT GRINDING FIXTURES Filed Sept. 20, 1960 r a 5 KM Hm M E 0 W A R 0 s w M E m United States Patent Illinois Filed Sept. 20,1960., Ser. No. 57,188

My invention relates to grinding fixtures.

Whilermy invention is. especially. adaptedforh-olding a perforator tool.in, grinding. relation with, respect to a grinding wheel for shaping thetool to the" desired form wanted for: the perforationoperationaitisunderstood that my. grinding fixture may be. utilized: for holding othertypesofi tools.

A principal. object. of this invention isthe provision of a fixtureWhichissimple in construction; of easy operation and capable .of.accomplishing. the .grinding'operation with the highest. degreeof.accuracy.

A. further. and equally. important object of this. invention; is theprovision. of. a simple arrangement capableof easy. operationforadjusting. the toolholiler in a. vertical plane whereby to properly andaccurately place the working end of the tool in proper relation withrespect to the grinding wheel or the like.

Another object of the invention is in the provision of a simplearrangement for yieldably holding the tool holder in position during itsvertical adjustment.

A still further object of the invention is the provision of accuratelygauging the tool to be ground in a proper relationship with respect tothe grinding wheel so as to produce any degree angle desired to beground.

Other objects will appear hereinafter.

The invention consists in the novel combination and arrangement of partsto be hereinafter described and claimed.

The invention will be best understood by reference to the accompanyingdrawings showing the preferred form of construction, and in which:

FIG. 1 is a perspective view of the tool holding side of my improvedgrinding fixture;

FIG. 2 is a perspective View of the opposite side of the grindingfixture;

FIG. 3 is an elevational FIG. 1;

FIG. 4 is a fragmentary detailed view taken substantially on line 4-4 ofFIG. 3;

FIG. 5 is a perspective view of an adjusting screw embodied in theinvention; and

FIG. 6 is an enlarged sectional detailed view taken substantially online 6-6 of FIG. 3.

The present invention constitutes an improvement over that shown in myPatent No. 2,449,459 dated September 14, 1948.

Like in my patent above referred to, my present grinding fixtureincludes a base 10 which is adapted to be mounted upon a magnetizedtable of a grinding fixture and held firmly thereby in proper grindingrelationship with respect to the grinding tool or wheel.

Preferably formed as an integral part of the base 10 is a mounting block11 within which there is mounted a tool holder mechanism indicatedgenerally at 12.

The mounting block 11 has formed therein a transversely extendingopening 13 within which is arranged an index plate 14. A manuallyoperated indexing finger 15 is carried by the block 11 and is intendedto engage the index plate 14 in a manner shown in my patent be forementioned so as to properly releasably latch the index plate 14 in apredetermined selected position.

The index plate includes a beveled edge 17 provided with graduationmarks exemplifying degrees. The plate 14 includes a sleeve 19 throughwhich a shaft 20 projects.

view of the tool as illustrated 3,094,821 Patented" June 25, 1963 ice;

The shaft-20 carries a handle 21 which facilitates rotating the indexplate 14. The index plate 14 is fixedly secured to a face plate 22 bymeans of threaded bolts 23, the connection being such as to-permit theindex plate 14- and the face plate 22 to rotate about their long axes.-To facilitate free rotation of the index plate 14 and face plate 22relative to the mounting block 11 I provide a raceway 24 in such blocl11. In such raceway are provided suitable bearings 25.

The peripheral edge of the plate 22 provides a dovetail rib or flange2'6 to which are attached; as in my prior patent, adjustable stops 27and 28 adapted to engage a stop pin 29 so" as to limitthe'degreeof'rotation of the tool holder. The pin 29-is slidably carriedby the mountingblock 11 and is adapted to be projected into the path ofthe stops 27 and 28 when the latter are used for the stated-purpose;

Secured to the face plate 22 are oppositely disposed guide plates 30each. of similar'construction and comprising on their opposing faces avertically extending flange 31. A tool base 32 comprises a V-shaped seat33 into which the shank of the tool 34 rests. The inner portion of thetool base 32 projects into a recess 35 forwardly of the flanges 31against which flanges 31 the tool base 32 is clamped by means of aclamping plate 37 having vertical side portions 38 engaging the oppositesides of the flanges 31. Formed in the tool base 32 is a thread bearingopening 39 having two counterbores 40 and 41 of difierent diameters.Threaded into the clamping plate 37 is the shank of a bolt 42 having ahead portion 43 arranged in the counterbore 41 of the opening 39 againsta washer 44. Arranged within the counter 40 of the opening 39 is a coilspring 45 which is normally under compression so as to maintain theplate 37 and the tool base 32 in yieldable sliding engagement with theflanges 31. The head 43 is provided with a tool receiving opening 46 toadjust the screw for increasing or decreasing the yieldable engagementhereinbefore mentioned.

The tool base provides oppositely disposed parallel grooves 47 arrangedin pairs to selectively receive the inturned ends 48 of a yoke 49. Theyoke 49 carries a thread bearing set screw 50 which is adapted to bethreaded upon the tool 34 for firmly holding the tool in the V-shapedseat 33 of the tool base 32. The bolt 42 and spring 45 holds the toolbase 32 frictionally against the flanges 31 while the tool base with orwithout the tool mounted therein is adjusted in a vertical plane. Suchadjustment is accomplished by providing on the inner face of the toolbase 3-2 a rack bar 51 having engagement with the teeth 52 of a bolt 53projected into an opening 54 formed in one of the guide plates 30. Thehead 55 of the bolt 53 is provided with an annular groove 56 in which ismounted an expansion ring 57 serving to maintain the bolt 53 in itsopening '54. The head 55 is provided with a tool receiving socket 58 tofacilitate rotating the head 55 to move the tool base 32 to an adjustedposition in a vertical plane with respect to the guide plates 30. Asbefore stated, during this adjustment the tool base is frictionally heldin position by the spring 45. After the adjustment has been accomplishedthe bolt 42 is threaded in a direction to firmly clamp the tool rest tothe flanges 31 of the guide plates 30.

The features of my present invention over those described in my priorpatent principally reside in the novel feature of adjusting the toolrest vertically between the guide plates and for holding the tool restin frictional engagement with the flanges of the guide plates duringsuch vertical adjustment. Without this latter feature the tool restwould very likely drop from its position With respect to the flanges ofthe guide plates 30.

From the foregoing, it is apparent that I have accomplish-ed the abovenovel features of my present invention by an arrangement that is simplein construction, easy to operate and economical in manufacture.

While I have illustrated and described the preferred form ofconstruction for carrying my invention intoeffect, this is capable ofvariation and modification without departing from the spirit of theinvention. I, therefore, do not wish to be limited to the precisedetails of construction set forth, but desire to avail myself of suchvariations and modifications as come Within the scope of the appendedclaim.

Having thus described my invention, what I claim as new and desire toprotect by Letters Patent is:

An improvement in a perforator grinding fixture which has a rotatableface plate and means for rotating the plate about its central axis, theimprovement comprising:

(a) oppositely disposed guide plates secured to the face plate in spacedrelation with respect to each other and having on their opposing sidesvertically extending flanges,

(b) a tool rest having a portion engaging said flanges on correspondingsides thereof,

(c) a clamping plate provided by said tool rest and engaging theopposite corresponding sides of the flanges,

(d) means for adjusting said tool rest and said clamping plate Verticallwith respect to said face plate, (e) and means for effecting clampingengagement of the tool rest and the clamping plate with respect to saidflanges to hold said tool rest and said clamping plate in frictionalengagement with said flanges during movement of said plate relative tosaid fl (1) said lastin the tool rest and threaded in the clamping andhaving a shoulder y with respect to said flanges and tool rest and saidclamping anges and said face plate, named means comprising a boltslidable plate an expansion spring interposed between of the tool restand the head of the bolt.

References Cited in the file of this patent UNITED STATES PATENTS CarlesSept. 20,

